--description--

Choose the right answer of using ago.

--questions--

If I read a book three weeks ago, when did I finish reading it?

I finished reading the book yesterday.

Yesterday is too recent compared to the timeframe mentioned.

I finished reading the book last month.

Last month might not accurately match the timeframe depending on the current date.

I finished reading it three weeks back.

I am still reading the book.

If you finished the book three weeks ago, you are not still reading it.